visual basic 2008 barcode generator Expressions and Statements in Java

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CHAPTER 3 Expressions and Statements
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that value is a signed value The leftmost bit is 1, which means that this is a negative value:
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Here s the same value after the bits are shifted to the right one position The leftmost bit must remain 1 because this bit signifies that this is a negative value:
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The following example shows how to use a signed right shift operator in a Java program Similar to the left shift operator, the right shift operator also requires two operands The left operand is the value whose bits are being shifted to the right The right operand is an integer that indicates the number of positions the value is being shifted In this example, bits are being shifted one place to the right:
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class Demo { public static void main (String args[]) { int a = -15, c = 0; c = a >> 1; Systemoutprintln (" a >> 1 = " + c); } }
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The unsigned right shift operator performs nearly the same operation as the signed right shift operator, except the unsigned right shift operator fills the leftmost empty space(s) with 0 because the value isn t a signed value Here s the unsigned right shift operator version of the previous program:
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class Demo { public static void main (String args[]) { int a = 15, c = 0; c = a >>> 1; Systemoutprintln (" a >>> 1 = " + c); } }
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Bitwise Complement Operator
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Still another way programmers change the value of bits is by using the complement operator (~) to flip each bit The complement operator changes a binary 0 to a binary 1, and it changes a binary 1 to a binary 0 Let s see how this works on the following value:
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By using the complement operator, we reverse each bit and end up with the following value This is equivalent to the decimal value 16 because the leftmost bit is a binary 1, which symbolizes a negative sign:
Here s how to use the complement operator in a Java program The complement operator requires one operand, which is the value whose bits are being flipped The resulting value is then assigned to a variable and displayed on the screen
class Demo { public static void main (String args[]) { int a = 15, c = 0; c = ~a; Systemoutprintln (" ~a = " + c); } }
Two s Complement
There are times when you ll come across a situation where you ll need to change the sign of a binary number from a positive to a negative or from a negative to a positive You can change the sign by using a technique called two s complement The two s complement technique adds 1 to the one s complement value that results in the sign being changed One s complement, two s complement These are confusing terms You might be scratching your head asking yourself, What is a complement Let s return to the example in the previous section to get a better understanding of what a complement is The example used the complement operator (~) to reverse each bit in a binary number A 0 became a 1, and a 1 became a 0 Programmers call this one s complement Two s complement requires you to first perform one s complement on a number (that is, change all the 0 s to 1 s, and all the 1 s to 0 s) and then add 1 to the result Let s see how this works in the following example As in the previous example, we ll use decimal values instead of binary values to make it easier to understand how two s complement works The example starts by assigning the value 15 to variable a, which is later displayed on the screen Next, the sign of the value 15 is changed from positive, which is implied, to negative by using two s complement The complement operator tells Java to flip the bits and then add 1 to the value to change the sign from positive to negative The result is assigned to variable c and is then displayed on the screen
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